Nightmare - Synonyms, Antonyms and Etymology | EWA Dictionary
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Nightmare

/ˈnaɪtmeə/
A very unpleasant dream that causes distress or anxiety during sleep.

Synonyms:

Antonyms:

Examples:

I had a nightmare about my test.Her boss is a real nightmare to work with.

Etymology:

etymology
Originated in the late 13th century from Middle English "night", combined with "mare", referring to a mythological female spirit believed to sit on people's chests while they slept.

Usage Statistics:

20 mentions per 1 million words Frequency
Often
bulb Hint: Frequency according to COCA
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